The Blackout AR-15 Muzzle Brake from AAC is a seriously effective, easy, and tough brake designed to drastically reduce the recoil coming from your weapon, thereby keeping you stable on your target for faster re-acquisitions of targets with each high-powered shot. This will let you follow up quicker from shot to shot. The Blackout Muzzle Brake comes machined from the best 17-4 stainless steel aerospace alloy and is coated in a durable, corrosion resistant, and extremely durable SCARmor finish. This will leave your weapon looking clean and neat. The 51T model of the Blackout Muzzle Brake works alongside Advanced Armament Corporation’s enhanced ratchet mounted noise suppressors. This is a mount that comes fully intuitive as a blazing fast attachment and detachment system for silencers, which will allow for the safe installation of your favorite suppressor in as quick as two seconds. You don’t even need any tools or additional parts to complete the setup. However, this model is not compatible with any of the 18-Tooth older spring style mount suppressors or the 90-Tooth new ratchet taper mount suppressors. You will need a torque wrench to complete installation of this unit, torqued to approx. 20-30 ft/lb. You cannot use this unit with the Scar 17 or the Ruger Gunsite Scout.